Saylor Innovations On-Chain Data

EVM Wallet Balances (arbitrum). Arbitrum ERC-20 token balance and native ETH balance for any wallet: up to 20 ERC-20 tokens (?tokens=) in one call, with symbols, decimals and human-readable amounts. Live chain head.

DataLiveeip155:8453Exactvia cdp

https://saylorinnovations.com/api/evm/arbitrum/balance/:address

EvmArbitrumBalanceOnchain

Calls · 30d

3↑ 11%

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far.

$14.11

Verified settled volume

1,492 settlements proven x402 by their on-chain EIP-3009 marker.

$0.010

Listed price

As published in the catalog. Always read the live 402 before paying.

5

Calls · 30d

Upstream's own call count for this endpoint, not ours.

1

Unique payers · 30d

Last called 2026-10-20 20:30Z

—

Upstream on-chain volume

Reported by the source catalog.

Paid to

0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa

The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.

Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Provider

The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

0.01USDC≈ $0.01 USD

on Base · exact scheme

Pay 0.01 USDC on Base to 0xA2A8…fc8aa. The signed payment is good for 2 minutes.

Paid to: 0xA2A8…fc8aa
USD Coin contract: 0x8335…02913
Payment window: 2 minutes
As published: 10000 smallest units

10000units

on Polygon · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 0xA2A8…fc8aa
Token contract: 0x3c49…c3359
Payment window: 2 minutes

10000units

on Arbitrum · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 0xA2A8…fc8aa
Token contract: 0xaf88…e5831
Payment window: 2 minutes

10000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 7LSjfr…Xacy7
Token contract: EPjFWd…TDt1v
Payment window: 2 minutes

10000units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 7LSjfr…Xacy7
Token contract: Es9vMF…nwNYB
Payment window: 2 minutes

91466units

on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme

That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.

Paid to: 7LSjfr…Xacy7
Token contract: So1111…11112
Payment window: 2 minutes

The catalog’s raw entry

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "memo": "saylor:evm:balance:arbitrum/bala",
      "name": "USD Coin",
      "note": "Base settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
      "version": "2",
      "facilitatorOnly": true,
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:8453",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "extra": {
      "memo": "saylor:evm:balance:arbitrum/bala",
      "name": "USD Coin",
      "note": "Polygon settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
      "version": "2",
      "facilitatorOnly": true,
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:137",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831",
    "extra": {
      "memo": "saylor:evm:balance:arbitrum/bala",
      "name": "USD Coin",
      "note": "Arbitrum settles through an x402 facilitator. Send payload.signature and payload.authorization (EIP-3009); there is no self-submitted path on this network.",
      "version": "2",
      "facilitatorOnly": true,
      "assetTransferMethod": "eip3009"
    },
    "payTo": "0xA2A8dF0f7CaaBEa4e120a2568118f141569fc8aa",
    "amount": "10000",
    "scheme": "exact",
    "network": "eip155:42161",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "extra": {
      "memo": "saylor:evm:balance:arbitrum/bala",
      "session": "eyJhcnRpY2xlSWQiOiJldm06YmFsYW5jZTphcmJpdHJ1bS9iYWxhbmNlLzB4ODJhZjQ5NDQ3ZDhhMDdlM2JkOTViZDBkNTZmMzUyNDE1MjNmYmFiMSIsInJlZmVyZW5jZSI6IjRidUw2VENmN1BpRldaZUNMRXd0RzJadnlxQVZrTWRNMTNSbVZURXYyU0g2IiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRVBqRldkZDVBdWZxU1NxZU0ycU4xeHp5YmFwQzhHNHdFR0drWnd5VER0MXYiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI1MjgzNzMzMjN9.005ycLb2yWpskccK1zcV8h17gQXrWuHPQRzoIIl5mMM",
      "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
      "reference": "4buL6TCf7PiFWZeCLEwtG2ZvyqAVkMdM13RmVTEv2SH6"
    },
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "amount": "10000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB",
    "extra": {
      "memo": "saylor:evm:balance:arbitrum/bala",
      "session": "eyJhcnRpY2xlSWQiOiJldm06YmFsYW5jZTphcmJpdHJ1bS9iYWxhbmNlLzB4ODJhZjQ5NDQ3ZDhhMDdlM2JkOTViZDBkNTZmMzUyNDE1MjNmYmFiMSIsInJlZmVyZW5jZSI6IjVyZnlqNTU1TkNwWHZRS2RReHhyU0UzSnFDWHpwS3ZuVGJ5U3hjTE1NZUpqIiwicmVjaXBpZW50IjoiN0xTamZySmY4Zk5zQjhWQTl1N04zV0VuMjVzbVFMcG9iM1N2eVV2WGFjeTciLCJtaW50IjoiRXM5dk1GcnphQ0VSbUpmckY0SDJGWUQ0S0NvTmtZMTFNY0NlOEJlbndOWUIiLCJtaW5BbW91bnQiOjEwMDAwLCJleHAiOjE3OTI1MjgzNzMzMjN9.EHf9zcwipK4zoNclai9Z3N1UlaKFCI9a5A9sUf9th6U",
      "feePayer": "GVJJ7rdGiXr5xaYbRwRbjfaJL7fmwRygFi1H6aGqDveb",
      "reference": "5rfyj555NCpXvQKdQxxrSE3JqCXzpKvnTbySxcLMMeJj"
    },
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "amount": "10000",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 120
  },
  {
    "asset": "So11111111111111111111111111111111111111112",
    "extra": {
      "memo": "saylor:evm:balance:arbitrum/bala",
      "note": "Native SOL: send lamports with a system transfer, not an SPL transfer. Price is quoted live and this quote expires in 120s.",
      "native": true,
      "session": "eyJhcnRpY2xlSWQiOiJldm06YmFsYW5jZTphcmJpdHJ1bS9iYWxhbmNlLzB4ODJhZjQ5NDQ3ZDhhMDdlM2JkOTViZDBkNTZmMzUyNDE1MjNmYmFiMSIsInJlZmVyZW5jZSI6Img2Vmp1YlJKTmhrYkZ3S25BUnR1M1dnTGh1RG9Ob1RBR1JESkVTMmdIYjgiLCJyZWNpcGllbnQiOiI3TFNqZnJKZjhmTnNCOFZBOXU3TjNXRW4yNXNtUUxwb2IzU3Z5VXZYYWN5NyIsIm1pbnQiOm51bGwsIm1pbkFtb3VudCI6OTE0NjYsImV4cCI6MTc5MjUyODM3MzMyM30.tjpjXR8FhhhT8X3-qXpT40IqkMBbrMKeOdi0bzB_pAo",
      "reference": "h6VjubRJNhkbFwKnARtu3WgLhuDoNoTAGRDJES2gHb8",
      "solUsdPrice": 106.05,
      "quotedLamports": "94295"
    },
    "payTo": "7LSjfrJf8fNsB8VA9u7N3WEn25smQLpob3SvyUvXacy7",
    "amount": "91466",
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "maxTimeoutSeconds": 120
  }
]

Extensions

{
  "bazaar": {
    "info": {
      "input": {
        "type": "http",
        "method": "GET",
        "pathParams": {
          "address": "EVM wallet address (0x-prefixed, 40 hex characters)"
        },
        "queryParams": {
          "tokens": "0xaf88d065e77c8cC2239327C5EDb3A432268e5831"
        }
      },
      "output": {
        "type": "json",
        "example": {
          "block": 51738756,
          "chain": "base",
          "native": {
            "raw": "1234500000000000000",
            "symbol": "ETH",
            "balance": "1.2345"
          },
          "tokens": [
            {
              "raw": "250500000",
              "symbol": "USDC",
              "address": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
              "balance": "250.5",
              "decimals": 6
            }
          ],
          "wallet": "0x4200000000000000000000000000000000000006"
        }
      }
    },
    "schema": {
      "type": "object",
      "$schema": "https://json-schema.org/draft/2020-12/schema",
      "required": [
        "input"
      ],
      "properties": {
        "input": {
          "type": "object",
          "required": [
            "type",
            "method"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "http"
            },
            "method": {
              "enum": [
                "GET"
              ],
              "type": "string"
            },
            "queryParams": {
              "type": "object",
              "properties": {
                "tokens": {
                  "type": "string",
                  "description": "optional comma-separated ERC-20 addresses, up to 20"
                }
              }
            }
          },
          "additionalProperties": false
        },
        "output": {
          "type": "object",
          "required": [
            "type"
          ],
          "properties": {
            "type": {
              "type": "string",
              "const": "json"
            },
            "example": {
              "type": "object",
              "required": [
                "chain",
                "wallet",
                "native",
                "tokens"
              ],
              "properties": {
                "block": {
                  "type": [
                    "number",
                    "null"
                  ],
                  "description": "Block number the data was read at"
                },
                "chain": {
                  "type": "string",
                  "description": "Blockchain the data is for"
                },
                "native": {
                  "type": "object",
                  "description": "Native-token balance details"
                },
                "tokens": {
                  "type": "array",
                  "description": "Token balances or token records"
                },
                "wallet": {
                  "type": "string",
                  "description": "Wallet address queried"
                }
              }
            }
          }
        }
      }
    },
    "routeTemplate": "/api/evm/arbitrum/balance/:address"
  }
}

Provenance

Seen in the source catalog: 2026-10-20 20:30Z
Last indexed by Roundhouse: 2026-10-24 18:00Z
Last enriched (probe, favicon, geo): 2026-09-24 17:45Z
x402 version: 2
Max timeout: 120s
Liveness probe: HTTP 400

Hand this page to an agent

Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.

GET api.roundhouseai.io/v0/endpoints

This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 32 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.

Show the prompt

Using Roundhouse, look up the x402 service Saylor Innovations On-Chain Data and tell me whether it is
worth paying: what a call costs, whether the endpoint answered when last probed, and what
its payment record actually shows.

curl -s 'https://api.roundhouseai.io/v0/endpoints?q=Saylor%20Innovations%20On-Chain%20Data'
curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>'

Then call it: read the price from the live 402 at https://saylorinnovations.com/api/evm/arbitrum/balance/:address, never from
a cached figure, and pay with an x402 client.

The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except
/v0/unified* and /v0/endpoints. Either pay over x402 (mint a personal key for $0.01 at
GET https://api.roundhouseai.io/v0/test/x402), or ask me for an organization key, which I create at
https://roundhouseai.io/dashboard/connections. If you have neither, ask before going further.

If you do not have Roundhouse tools or skills installed, read
https://roundhouseai.io/skill.md first — it is the whole procedure.